Availability of used SL-1200s is not an issue, at least not for me. I've seen dozens of them on sale locally, in various conditions. From the two badly-damaged & vandalized (but otherwise functional) 1200 Mk2 units sold together for the price of $750, to fairly decent 1210 Mk5 for around $570 and all the way to brand new, unopened SL1200GR with Ortofon 2m Black (also brand new, inside the box) for the price of around $2000,00
Sooo yes, I would have to agree regarding being the most expensive choice. There's also plenty of other Technics to choose from, such as SL-3110 for example. Seems like a decent table, wouldn't mind owning one actually. But again, the asking price is around $285, which is quite expensive for used gear IMO. Especially if you're not willing to invest further into the parts & maintenance. For someone who is not experienced with electronics & soldering, or capable to invest more funds into the replacement parts, those $285 would be better spent on a new Audio Technica or similar Hanpin model.
I also realize there are other & cheaper models (such as SL1300, which you mentioned) but like I said - it all comes down to condition & repairs. There's no telling how much work is involved until you actually have it in your hands, all set up & ready to go. Heck, I've experienced the same thing first hand, when my next-door neighbor asked me to take a quick look at his Thorens TD-110 & maybe fix a thing or two. We already knew that it needed a new stylus, but what I didn't realize is that everything (and I really DO mean everything) on that table was out of spec or causing some sort of problem. Belt was completely shot, motor bearing was noisy & squeaking, cue lever wasn't working, RCA cable had a short & needed to be replaced, power "flip" switch was seized up & not engaging when toggled, etc, etc. At some point I was so angry & frustrated that I almost threw the entire thing through the window! Needless to say, I got it fixed eventually and I only charged him for the new stylus. But that's beside the point...